sloan



UNITED STATES PATENT OFFICE.

VM. D. SLOAN, OF NEV YORK, N. Y.

TURNING-LATHE.

Specification of Letters Patent No. 19,051, dated January 5, 1858.

To all whom it may concern.'

Be it known that l, Timun D. SLoAN, of the city, county, and State of New York, have invented a certain new and useful Im provement in the Machine for Turning; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 is a front elevation of the machine with part of the frame work removed the better to exhibit the parts below the table; Fig. 2 an end elevation; Fig. 3 a cross vertical section taken at the line A, a, of Fig. 1, and Fig. 4 a longitudinal section taken at the line B, Z) of Fig. 3.

The same letters indicate like parts in all the figures.

My present invention is specially intended as an improvement on a machine for turn ing secured to me by Letters Patent bearing date the 31st day of March 1857, in which several blocks are simultaneously subjected to the operations of several cutters, and shifted from one cutter or set of cutters, to another cutter or set of cutters, so that each block is shifted and carried in succession to the entire series of cutters; but my said improvement will be equally applicable to any other turning machine designed for shifting the blocks from one to another of a succession of cutters. And my said invention consists in combining with a series of rotating mandrels arranged about a common center and so arranged that the blocks which they carry and turn can be shifted in succession from one position to another-to undergo a succession of operations, a series of radial rests so arranged that they are forced outward to give support to the said blocks when rotated and acted upon by suitable cutters, and drawn inward to relieve the said blocks preparatory to the shifting operation.

ln the accompanying drawings (a) represents a suitable frame, and (b) a horizontal hollow shaft mounted in two standards of the said frame. This shaft carries plates (c, e, c, c) in which are mounted a series of mandrels (d, d, d, d, d) and corresponding centers for holding the blocks (f) to be turned on the mandrels. It is deemed unnecessary to describe specially these parts and the cutters to be employed as these make no part of my present invention and will be found fully described in the Letters Patent I before recited.

The said shaft with its mandrels, &c., is turned by an intermittent rotary motion to bring each mandrel with its block to each of a series of positions and hold it at each position for the required length of time. This intermittent motion is imparted by a crank pin on a spur wheel (h) which derives motion from the driving shaft (i) by another spur wheel As the crank pin (g) revolves it enters one of a series of radial slots (7a) cut into the periphery of a wheel (Z) on the end of the shaft (b), and gradually turns the shaft to the required extent, and then stops it and comes out of the said slot and at its next revolution enters the next of the series of slots; in that way, as there are as many slots in the said wheel as there are mandi-els about the shaft, the mandrels are shifted and at the end of each shifting held in the required position.

On the shaft (b) there is a hub with as many hollow radial arms (n) as there are mandrels, and to the inside of each arm is fitted a sliding rest (o) the outer end of which is to be suitably shaped to bear against and support the outer circumference of the block to be turned; and the inner end slightly beveled and passing through the hub and shaft to bear on the surface of a cone (p) on the end of a sliding cylindrical rod (Q) fitted to, and sliding in the hollow shaft. The inner end of the said rest is made to bear on the surface of the cone by the tension of a spring attached to the rest and to the hub.

All the rests are made mounted and operated alike. When the rod (q) is moved in the direction of the arrow (see Fig. 4) the cone (p) acts on, and forces out the rests so that their outer ends shall bear against and support the blocks while being turned, and when moved in the opposite direction it permits the rests to be drawn in away from the blocks by the tension of the springs. And the rod (g) with its cone (p) is operated by a sliding bar (s) provided with an arm and collar (t) that embraces the outer end of the rod as represented; and the bar (s) is operated to move the rod in the direction of the arrow by a cam (u) on a cross shaft (o) receiving motion from the driving shaft by a pair of bevel cog wheels (w, w), and the form of the cam is such as to permit the bar and rod to be moved in the opposite direction by the tension of a spring (fr) attached to the bar and to the frame.

The rod (g) With its cone (p) does not rotate With the shaft (ZJ) and its series of mandrels, and as the rests are not required to be forced out against the blocks in some of the positions, such, for instance, as the position Where a fresh block is put onto the mandrel, and Where the first rangling cutter, and Where the last finishing cutter operate on the block, the cone is cut out in the corresponding parts so that as each rest is, by the rotation of the shaft, brought to either of same time the tension of the spring Will be suicient to steady and keep the block from chattering when acted upon by the cutters.

I do not Wish to be understood as limiting my claim of invention to the special construction and arrangement of the parts as above described, but claim the privilege of modifying these so long as the same mode of operation is obtained by equivalent means.

What I claim as my invention and desire to secure by Letters Patent is The combination of the series of radially sliding rests, substantially as described, in combination with the series of shifting mandrels, substantially as and for the purpose specified.

WVM. D. SLOAN. 

